Could NOT find DBus1 (missing: DBus1_ARCH_INCLUDE_DIR) with autotools

After building dbus with autotools with the files added from !184 and running something like this

rm -rf /home/ralf/src/dbus-autotools-build/tmp /home/ralf/src/dbus-autotools-build/test/install
/usr/bin/ctest "--build-and-test" "/home/ralf/src/dbus/test/install" "/home/ralf/src/dbus-autotools-build/test/install" "--build-generator" "Unix Makefiles" "--build-makeprogram" "/usr/bin/gmake" "--build-target" "install" "--build-options" "-DDBus1_ROOT=/home/ralf/src/dbus-autotools-build/tmp/usr/local/lib64/cmake/DBus1" "-DCMAKE_INSTALL_PREFIX:PATH=/home/ralf/src/dbus-autotools-build/tmp/usr/local" "-DCHECK_VERSION=1.13.18"

I get

Error: cmake execution failed
Could NOT find DBus1 (missing: DBus1_ARCH_INCLUDE_DIR) 
CMake Warning at CMakeLists.txt:8 (find_package):
  Found package configuration file:
    /home/ralf/src/dbus-autotools-build/tmp/usr/local/lib64/cmake/DBus1/DBus1Config.cmake
  but it set DBus1_FOUND to FALSE so package "DBus1" is considered to be NOT
  FOUND.
Configuring done

This issue blocks testing !172 (merged)